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e23a0ce8 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
e23a0ce8 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
e23a0ce8 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
e23a0ce8 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include "log.h" | |
27 | #include "util.h" | |
28 | #include "unit-name.h" | |
49e942b2 | 29 | #include "mkdir.h" |
e23a0ce8 LP |
30 | |
31 | const char *arg_dest = "/tmp"; | |
32 | ||
33 | static bool has_option(const char *haystack, const char *needle) { | |
34 | const char *f = haystack; | |
35 | size_t l; | |
36 | ||
f653f683 LP |
37 | assert(needle); |
38 | ||
39 | if (!haystack) | |
40 | return false; | |
41 | ||
e23a0ce8 LP |
42 | l = strlen(needle); |
43 | ||
44 | while ((f = strstr(f, needle))) { | |
45 | ||
46 | if (f > haystack && f[-1] != ',') { | |
47 | f++; | |
48 | continue; | |
49 | } | |
50 | ||
aae5220d | 51 | if (f[l] != 0 && f[l] != ',') { |
e23a0ce8 LP |
52 | f++; |
53 | continue; | |
54 | } | |
55 | ||
56 | return true; | |
57 | } | |
58 | ||
59 | return false; | |
60 | } | |
61 | ||
62 | static int create_disk( | |
63 | const char *name, | |
64 | const char *device, | |
65 | const char *password, | |
66 | const char *options) { | |
67 | ||
74715b82 | 68 | char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *from = NULL, *to = NULL, *e = NULL; |
e23a0ce8 LP |
69 | int r; |
70 | FILE *f = NULL; | |
155da457 | 71 | bool noauto, nofail; |
e23a0ce8 LP |
72 | |
73 | assert(name); | |
74 | assert(device); | |
75 | ||
155da457 LP |
76 | noauto = has_option(options, "noauto"); |
77 | nofail = has_option(options, "nofail"); | |
78 | ||
e23a0ce8 LP |
79 | if (!(n = unit_name_build_escape("cryptsetup", name, ".service"))) { |
80 | r = -ENOMEM; | |
81 | log_error("Failed to allocate unit name."); | |
82 | goto fail; | |
83 | } | |
84 | ||
85 | if (asprintf(&p, "%s/%s", arg_dest, n) < 0) { | |
86 | r = -ENOMEM; | |
87 | log_error("Failed to allocate unit file name."); | |
88 | goto fail; | |
89 | } | |
90 | ||
91 | if (!(u = fstab_node_to_udev_node(device))) { | |
92 | r = -ENOMEM; | |
93 | log_error("Failed to allocate device node."); | |
94 | goto fail; | |
95 | } | |
96 | ||
97 | if (!(d = unit_name_from_path(u, ".device"))) { | |
98 | r = -ENOMEM; | |
99 | log_error("Failed to allocate device name."); | |
100 | goto fail; | |
101 | } | |
102 | ||
103 | if (!(f = fopen(p, "wxe"))) { | |
104 | r = -errno; | |
105 | log_error("Failed to create unit file: %m"); | |
106 | goto fail; | |
107 | } | |
108 | ||
109 | fprintf(f, | |
110 | "[Unit]\n" | |
a4477e68 | 111 | "Description=Cryptography Setup for %%I\n" |
155da457 | 112 | "Conflicts=umount.target\n" |
e23a0ce8 | 113 | "DefaultDependencies=no\n" |
49d50c55 | 114 | "BindTo=%s dev-mapper-%%i.device\n" |
e23a0ce8 | 115 | "After=systemd-readahead-collect.service systemd-readahead-replay.service %s\n" |
87e75fdd | 116 | "Before=umount.target\n", |
e23a0ce8 LP |
117 | d, d); |
118 | ||
155da457 LP |
119 | if (!nofail) |
120 | fprintf(f, | |
121 | "Before=cryptsetup.target\n"); | |
122 | ||
e23a0ce8 LP |
123 | if (password && (streq(password, "/dev/urandom") || |
124 | streq(password, "/dev/random") || | |
125 | streq(password, "/dev/hw_random"))) | |
126 | fprintf(f, | |
127 | "After=systemd-random-seed-load.service\n"); | |
87e75fdd TG |
128 | else |
129 | fprintf(f, | |
130 | "Before=local-fs.target\n"); | |
e23a0ce8 LP |
131 | |
132 | fprintf(f, | |
133 | "\n[Service]\n" | |
134 | "Type=oneshot\n" | |
135 | "RemainAfterExit=yes\n" | |
90724929 | 136 | "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
260ab287 | 137 | "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n" |
7f4e0805 | 138 | "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
e23a0ce8 LP |
139 | name, u, strempty(password), strempty(options), |
140 | name); | |
141 | ||
f653f683 | 142 | if (has_option(options, "tmp")) |
e23a0ce8 | 143 | fprintf(f, |
50109038 | 144 | "ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n", |
1d3399e6 | 145 | name); |
e23a0ce8 | 146 | |
f653f683 | 147 | if (has_option(options, "swap")) |
e23a0ce8 | 148 | fprintf(f, |
50109038 | 149 | "ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n", |
1d3399e6 | 150 | name); |
e23a0ce8 LP |
151 | |
152 | fflush(f); | |
153 | ||
154 | if (ferror(f)) { | |
155 | r = -errno; | |
156 | log_error("Failed to write file: %m"); | |
157 | goto fail; | |
158 | } | |
159 | ||
74715b82 LP |
160 | if (asprintf(&from, "../%s", n) < 0) { |
161 | r = -ENOMEM; | |
162 | goto fail; | |
163 | } | |
164 | ||
155da457 | 165 | if (!noauto) { |
e23a0ce8 LP |
166 | |
167 | if (asprintf(&to, "%s/%s.wants/%s", arg_dest, d, n) < 0) { | |
168 | r = -ENOMEM; | |
169 | goto fail; | |
170 | } | |
171 | ||
e23a0ce8 LP |
172 | mkdir_parents(to, 0755); |
173 | ||
174 | if (symlink(from, to) < 0) { | |
175 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
176 | r = -errno; | |
177 | goto fail; | |
178 | } | |
2f8cd170 LP |
179 | |
180 | free(to); | |
181 | to = NULL; | |
182 | ||
155da457 LP |
183 | if (!nofail) |
184 | asprintf(&to, "%s/cryptsetup.target.requires/%s", arg_dest, n); | |
185 | else | |
186 | asprintf(&to, "%s/cryptsetup.target.wants/%s", arg_dest, n); | |
2f8cd170 | 187 | |
155da457 LP |
188 | if (!to) { |
189 | r = -ENOMEM; | |
190 | goto fail; | |
191 | } | |
2f8cd170 | 192 | |
155da457 | 193 | mkdir_parents(to, 0755); |
2f8cd170 | 194 | |
155da457 LP |
195 | if (symlink(from, to) < 0) { |
196 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
197 | r = -errno; | |
198 | goto fail; | |
2f8cd170 | 199 | } |
e23a0ce8 LP |
200 | } |
201 | ||
74715b82 LP |
202 | free(to); |
203 | to = NULL; | |
204 | ||
205 | e = unit_name_escape(name); | |
8c4dd542 | 206 | if (asprintf(&to, "%s/dev-mapper-%s.device.requires/%s", arg_dest, e, n) < 0) { |
74715b82 LP |
207 | r = -ENOMEM; |
208 | goto fail; | |
209 | } | |
210 | ||
211 | mkdir_parents(to, 0755); | |
212 | ||
213 | if (symlink(from, to) < 0) { | |
214 | log_error("Failed to create symlink '%s' to '%s': %m", from, to); | |
215 | r = -errno; | |
216 | goto fail; | |
217 | } | |
218 | ||
e23a0ce8 LP |
219 | r = 0; |
220 | ||
221 | fail: | |
222 | free(p); | |
223 | free(n); | |
224 | free(d); | |
74715b82 | 225 | free(e); |
e23a0ce8 LP |
226 | |
227 | free(from); | |
228 | free(to); | |
229 | ||
230 | if (f) | |
231 | fclose(f); | |
232 | ||
233 | return r; | |
234 | } | |
235 | ||
236 | int main(int argc, char *argv[]) { | |
237 | FILE *f; | |
238 | int r = EXIT_SUCCESS; | |
239 | unsigned n = 0; | |
240 | ||
241 | if (argc > 2) { | |
242 | log_error("This program takes one or no arguments."); | |
243 | return EXIT_FAILURE; | |
244 | } | |
245 | ||
2a796654 LP |
246 | if (argc > 1) |
247 | arg_dest = argv[1]; | |
e23a0ce8 | 248 | |
4cfa2c99 | 249 | log_set_target(LOG_TARGET_AUTO); |
e23a0ce8 LP |
250 | log_parse_environment(); |
251 | log_open(); | |
252 | ||
4c12626c LP |
253 | umask(0022); |
254 | ||
e23a0ce8 LP |
255 | if (!(f = fopen("/etc/crypttab", "re"))) { |
256 | ||
257 | if (errno == ENOENT) | |
258 | r = EXIT_SUCCESS; | |
259 | else { | |
260 | r = EXIT_FAILURE; | |
261 | log_error("Failed to open /etc/crypttab: %m"); | |
262 | } | |
263 | ||
264 | goto finish; | |
265 | } | |
266 | ||
267 | for (;;) { | |
268 | char line[LINE_MAX], *l; | |
269 | char *name = NULL, *device = NULL, *password = NULL, *options = NULL; | |
270 | int k; | |
271 | ||
272 | if (!(fgets(line, sizeof(line), f))) | |
273 | break; | |
274 | ||
275 | n++; | |
276 | ||
277 | l = strstrip(line); | |
278 | if (*l == '#' || *l == 0) | |
279 | continue; | |
280 | ||
281 | if ((k = sscanf(l, "%ms %ms %ms %ms", &name, &device, &password, &options)) < 2 || k > 4) { | |
282 | log_error("Failed to parse /etc/crypttab:%u, ignoring.", n); | |
283 | r = EXIT_FAILURE; | |
284 | goto next; | |
285 | } | |
286 | ||
287 | if (create_disk(name, device, password, options) < 0) | |
288 | r = EXIT_FAILURE; | |
289 | ||
290 | next: | |
291 | free(name); | |
292 | free(device); | |
293 | free(password); | |
294 | free(options); | |
295 | } | |
296 | ||
297 | finish: | |
298 | return r; | |
299 | } |